Veris Technologies MSP EC and pH (1997-2008 floppy disk drive 1.02E) - Operating Instructions User Manual
Page 58
Veris Technologies
Pub. #OM MSP03-1
58
Figure 2. Inspecting pins on communication cable
2. Testing continuity on communication cable.
a) Unplug the communication cable from the Instrument.
b) Bring both ends of the communication cable close enough together to reach with a
voltmeter.
c) Set your voltmeter to resistance (or continuity). Check continuity between the
following pins: (Figure 3.)
(you will need to insert a solid-conductor wire or paper clip
attached to a wire into the sockets of the serial connector unless
your voltmeter leads are very small)
Figure 3. 9 pin serial connector (left) and 4 pin round connector (right)
3. Testing continuity from the circuit board through the communication cable
a) Remove the steel cover and unscrew the plastic lid from the external Controller.
b) Look for the brown Molex 3-pin connector circled in Figure 4. The color sequence
(left->right) should be white-green-black. CAREFULLY wiggle each wire to check for
a loose connection.
c) Check continuity between the following pins:
Figure 4. Brown Molex connector on circuit board (POWER MUST BE DISCONNECTED BEFORE
TESTING)
4 pin connector
Serial connector
1
2
2
3
3
5